/*******************************************************************************
 * Copyright (c) 2012 GigaSpaces Technologies Ltd. All rights reserved
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 ******************************************************************************/
package org.cloudifysource.shell.commands;

import org.apache.felix.gogo.commands.Command;
import org.cloudifysource.dsl.internal.CloudifyConstants;
import org.cloudifysource.dsl.rest.response.ApplicationDescription;
import org.cloudifysource.restclient.RestClient;
import org.cloudifysource.restclient.exceptions.RestClientException;
import org.cloudifysource.shell.exceptions.CLIStatusException;
import org.cloudifysource.shell.rest.RestAdminFacade;

/**
 * @author noak, adaml
 * @since 2.0.1
 * 
 *        Lists the services deployed on the current application
 * 
 *        Command syntax: list-services
 * 
 */
@Command(scope = "cloudify", name = "list-services", description = "Lists all deployed services on the current"
		+ " application")
public class ListServices extends AbstractListCommand implements NewRestClientCommand {

	/**
	 * Gets a list of service names, deployed on the current application.
	 * 
	 * @return Object A list of Strings, representing the services' names
	 * @throws Exception
	 *             Reporting a failure to get the services' names from the REST server
	 */
	@Override
	protected Object doExecute() throws Exception {
		ApplicationDescription applicationDescription = null;
		try {
			final String applicationName = getCurrentApplicationName();
			applicationDescription = adminFacade.getServicesDescriptionList(applicationName);
			if (applicationDescription == null) {
				return "";
			}
		} catch (final CLIStatusException e) {
			// if this message indicates the *default* app is not found - don't throw exception, return an
			// empty list
			if (getCurrentApplicationName().equalsIgnoreCase(CloudifyConstants.DEFAULT_APPLICATION_NAME)
					&& CloudifyConstants.ERR_REASON_CODE_FAILED_TO_LOCATE_APP.equalsIgnoreCase(e.getReasonCode())) {
				return "";
			} else {
				throw e;
			}
		}

		return getApplicationDescriptionAsString(applicationDescription);
	}

	@Override
	public Object doExecuteNewRestClient() throws Exception {
		logger.fine("list-services using the new rest client");
		final RestClient newRestClient = ((RestAdminFacade) getRestAdminFacade()).getNewRestClient();

		ApplicationDescription applicationDescription = null;
		final String applicationName = getCurrentApplicationName();
		try {
			applicationDescription = newRestClient.getApplicationDescription(applicationName);
		} catch (final RestClientException e) {
			// if this message indicates the *default* app is not found - don't throw exception, return an
			// empty list
			if (applicationName.equalsIgnoreCase(CloudifyConstants.DEFAULT_APPLICATION_NAME)
					&& CloudifyConstants.ERR_MESSAGE_CODE_MISSING_RESOURCE.equalsIgnoreCase(e.getMessageCode())) {
				return "";
			}
			if (CloudifyConstants.ERR_MESSAGE_CODE_MISSING_RESOURCE.equalsIgnoreCase(e.getMessageCode())) {
				throw new CLIStatusException(CloudifyConstants.ERR_REASON_CODE_FAILED_TO_LOCATE_APP, applicationName);
			} else {
				throw e;
			}
		}

		if (applicationDescription == null) {
			return "";
		}

		return getApplicationDescriptionAsString(applicationDescription);
	}

}
